CVE-2025-37798

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There is no remote entry point into the qdisc class hierarchy setup.\nAC:L - The attacker controls every input: the qdisc hierarchy, CoDel's target/interval (unvalidated in codel_change()), the device MTU that defeats the backlog>mtu drop guard, the traffic that fills and empties the queue, and the moment the class is deleted. The inconsistent active-but-empty class state persists indefinitely, so no race window must be won.\nPR:L - Configuring qdiscs requires CAP_NET_ADMIN, but rtnetlink checks it via sk_ns_capable(sk, net->user_ns, CAP_NET_ADMIN), which any unprivileged local user obtains inside a `unshare -Urn` user+network namespace. Per kernel scoring guidance, tc/qdisc reachable through user namespaces is Low, not High.\nUI:N - The attacker performs every step \u2014 qdisc setup, traffic generation, and class deletion \u2014 within their own namespace. No victim action or interaction is needed.\nS:U - The corruption is confined to kernel heap objects and scheduler data structures managed by the same kernel security authority. No VM, IOMMU, or sandbox boundary is crossed.\nC:H - The freed drr_class/qfq_class/hfsc_class remains linked in the parent's active list and rbtrees; after heap reclaim the attacker controls the object contents and the traversals read kernel pointers back out of it, yielding an arbitrary-read primitive and kernel address disclosure. Per guidance, use-after-free is High.\nI:H - Subsequent list_del/list_add and rb_erase operations write through pointers stored in the freed object, and drr_dequeue()/agg_dequeue() perform an indirect call via cl->qdisc->ops->peek() on reclaimed memory, giving a write primitive and control-flow hijack suitable for full privilege escalation.\nA:H - Even without successful exploitation, the dangling class in the active list/rbtree causes list and red-black-tree corruption and dereference of poisoned or freed pointers, producing a kernel oops or panic that can be triggered repeatedly by an unprivileged user."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/sched/sch_codel.c", "net/sched/sch_fq_codel.c"], "versions": [{"version": "76e3cc126bb223013a6b9a0e2a51238d1ef2e409", "lessThan": "7a742a9506849d1c1aa71e36c89855ceddc7d58e", "status": "affected", "versionType": "git"}, {"version": "76e3cc126bb223013a6b9a0e2a51238d1ef2e409", "lessThan": "cc71a757da78dd4aa1b4a9b19cb011833730ccf2", "status": "affected", "versionType": "git"}, {"version": "76e3cc126bb223013a6b9a0e2a51238d1ef2e409", "lessThan": "eda741fe155ddf5ecd2dd3bfbd4fc3c0c7dbb450", "status": "affected", "versionType": "git"}, {"version": "76e3cc126bb223013a6b9a0e2a51238d1ef2e409", "lessThan": "829c49b6b2ff45b043739168fd1245e4e1a91a30", "status": "affected", "versionType": "git"}, {"version": "76e3cc126bb223013a6b9a0e2a51238d1ef2e409", "lessThan": "2f9761a94bae33d26e6a81b31b36e7d776d93dc1", "status": "affected", "versionType": "git"}, {"version": "76e3cc126bb223013a6b9a0e2a51238d1ef2e409", "lessThan": "4d55144b12e742404bb3f8fee6038bafbf45619d", "status": "affected", "versionType": "git"}, {"version": "76e3cc126bb223013a6b9a0e2a51238d1ef2e409", "lessThan": "e73c838c80dccb9e4f19becc11d9f3cb4a27d483", "status": "affected", "versionType": "git"}, {"version": "76e3cc126bb223013a6b9a0e2a51238d1ef2e409", "lessThan": "a57fe60ef4cf96bfbb6b58397ec28bdb5a5c6b31", "status": "affected", "versionType": "git"}, {"version": "76e3cc126bb223013a6b9a0e2a51238d1ef2e409", "lessThan": "342debc12183b51773b3345ba267e9263bdfaaef", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/sched/sch_codel.c", "net/sched/sch_fq_codel.c"], "versions": [{"version": "3.5", "status": "affected"}, {"version": "0", "lessThan": "3.5", "status": "unaffected", "versionType": "semver"}, {"version": "5.4.297", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.241", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.190", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.135", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.88", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.24", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.13.12", "lessThanOrEqual": "6.13.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.14.3", "lessThanOrEqual": "6.14.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.15", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.5", "versionEndExcluding": "5.4.297"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.5", "versionEndExcluding": "5.10.241"}, {"vulnerable": true, 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"versionEndExcluding": "6.15"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/7a742a9506849d1c1aa71e36c89855ceddc7d58e"}, {"url": "https://git.kernel.org/stable/c/cc71a757da78dd4aa1b4a9b19cb011833730ccf2"}, {"url": "https://git.kernel.org/stable/c/eda741fe155ddf5ecd2dd3bfbd4fc3c0c7dbb450"}, {"url": "https://git.kernel.org/stable/c/829c49b6b2ff45b043739168fd1245e4e1a91a30"}, {"url": "https://git.kernel.org/stable/c/2f9761a94bae33d26e6a81b31b36e7d776d93dc1"}, {"url": "https://git.kernel.org/stable/c/4d55144b12e742404bb3f8fee6038bafbf45619d"}, {"url": "https://git.kernel.org/stable/c/e73c838c80dccb9e4f19becc11d9f3cb4a27d483"}, {"url": "https://git.kernel.org/stable/c/a57fe60ef4cf96bfbb6b58397ec28bdb5a5c6b31"}, {"url": "https://git.kernel.org/stable/c/342debc12183b51773b3345ba267e9263bdfaaef"}], "title": "codel: remove sch->q.qlen check before qdisc_tree_reduce_backlog()", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"title": "CVE Program Container", "references": [{"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"}, {"url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T19:55:29.865Z"}}, {"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2025-37798", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-15T21:45:14.746981Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-15T21:51:59.989Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CVE Program Container", "references": [{"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"}, {"url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html"}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2025-11-03T19:55:29.865Z"}}, {"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2025-37798", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-15T21:45:14.746981Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-15T21:45:15.322Z"}}], "cna": {"title": "codel: remove sch->q.qlen check before qdisc_tree_reduce_backlog()", "metrics": [{"cvssV3_1": {"version": "3.1", "baseScore": 7.8, "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}, "scenarios": [{"lang": "en", "value": "AV:L - The vulnerable state is created and triggered through tc/rtnetlink qdisc configuration (RTM_NEWQDISC/RTM_NEWTCLASS/RTM_DELTCLASS) plus locally generated traffic over a loopback or veth device. There is no remote entry point into the qdisc class hierarchy setup.\nAC:L - The attacker controls every input: the qdisc hierarchy, CoDel's target/interval (unvalidated in codel_change()), the device MTU that defeats the backlog>mtu drop guard, the traffic that fills and empties the queue, and the moment the class is deleted. The inconsistent active-but-empty class state persists indefinitely, so no race window must be won.\nPR:L - Configuring qdiscs requires CAP_NET_ADMIN, but rtnetlink checks it via sk_ns_capable(sk, net->user_ns, CAP_NET_ADMIN), which any unprivileged local user obtains inside a `unshare -Urn` user+network namespace. Per kernel scoring guidance, tc/qdisc reachable through user namespaces is Low, not High.\nUI:N - The attacker performs every step \u2014 qdisc setup, traffic generation, and class deletion \u2014 within their own namespace. No victim action or interaction is needed.\nS:U - The corruption is confined to kernel heap objects and scheduler data structures managed by the same kernel security authority. No VM, IOMMU, or sandbox boundary is crossed.\nC:H - The freed drr_class/qfq_class/hfsc_class remains linked in the parent's active list and rbtrees; after heap reclaim the attacker controls the object contents and the traversals read kernel pointers back out of it, yielding an arbitrary-read primitive and kernel address disclosure. Per guidance, use-after-free is High.\nI:H - Subsequent list_del/list_add and rb_erase operations write through pointers stored in the freed object, and drr_dequeue()/agg_dequeue() perform an indirect call via cl->qdisc->ops->peek() on reclaimed memory, giving a write primitive and control-flow hijack suitable for full privilege escalation.\nA:H - Even without successful exploitation, the dangling class in the active list/rbtree causes list and red-black-tree corruption and dereference of poisoned or freed pointers, producing a kernel oops or panic that can be triggered repeatedly by an unprivileged user."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "76e3cc126bb223013a6b9a0e2a51238d1ef2e409", "lessThan": "7a742a9506849d1c1aa71e36c89855ceddc7d58e", "versionType": "git"}, {"status": "affected", "version": "76e3cc126bb223013a6b9a0e2a51238d1ef2e409", "lessThan": "cc71a757da78dd4aa1b4a9b19cb011833730ccf2", "versionType": "git"}, {"status": "affected", "version": "76e3cc126bb223013a6b9a0e2a51238d1ef2e409", "lessThan": "eda741fe155ddf5ecd2dd3bfbd4fc3c0c7dbb450", "versionType": "git"}, {"status": "affected", "version": "76e3cc126bb223013a6b9a0e2a51238d1ef2e409", "lessThan": "829c49b6b2ff45b043739168fd1245e4e1a91a30", "versionType": "git"}, {"status": "affected", "version": "76e3cc126bb223013a6b9a0e2a51238d1ef2e409", "lessThan": "2f9761a94bae33d26e6a81b31b36e7d776d93dc1", "versionType": "git"}, {"status": "affected", "version": "76e3cc126bb223013a6b9a0e2a51238d1ef2e409", "lessThan": "4d55144b12e742404bb3f8fee6038bafbf45619d", "versionType": "git"}, {"status": "affected", "version": "76e3cc126bb223013a6b9a0e2a51238d1ef2e409", "lessThan": "e73c838c80dccb9e4f19becc11d9f3cb4a27d483", "versionType": "git"}, {"status": "affected", "version": "76e3cc126bb223013a6b9a0e2a51238d1ef2e409", "lessThan": "a57fe60ef4cf96bfbb6b58397ec28bdb5a5c6b31", 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"versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.24", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.13.12", "versionType": "semver", "lessThanOrEqual": "6.13.*"}, {"status": "unaffected", "version": "6.14.3", "versionType": "semver", "lessThanOrEqual": "6.14.*"}, {"status": "unaffected", "version": "6.15", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["net/sched/sch_codel.c", "net/sched/sch_fq_codel.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/7a742a9506849d1c1aa71e36c89855ceddc7d58e"}, {"url": "https://git.kernel.org/stable/c/cc71a757da78dd4aa1b4a9b19cb011833730ccf2"}, {"url": "https://git.kernel.org/stable/c/eda741fe155ddf5ecd2dd3bfbd4fc3c0c7dbb450"}, {"url": "https://git.kernel.org/stable/c/829c49b6b2ff45b043739168fd1245e4e1a91a30"}, {"url": "https://git.kernel.org/stable/c/2f9761a94bae33d26e6a81b31b36e7d776d93dc1"}, {"url": "https://git.kernel.org/stable/c/4d55144b12e742404bb3f8fee6038bafbf45619d"}, {"url": "https://git.kernel.org/stable/c/e73c838c80dccb9e4f19becc11d9f3cb4a27d483"}, {"url": "https://git.kernel.org/stable/c/a57fe60ef4cf96bfbb6b58397ec28bdb5a5c6b31"}, {"url": "https://git.kernel.org/stable/c/342debc12183b51773b3345ba267e9263bdfaaef"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncodel: remove sch->q.qlen check before qdisc_tree_reduce_backlog()\n\nAfter making all ->qlen_notify() callbacks idempotent, now it is safe to\nremove the check of qlen!=0 from both fq_codel_dequeue() and\ncodel_qdisc_dequeue()."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.4.297", 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"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: codel: remove sch->q.qlen check before qdisc_tree_reduce_backlog()", "id": "2363671", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2363671"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-20", "details": ["In the Linux kernel, the following vulnerability has been resolved:\ncodel: remove sch->q.qlen check before qdisc_tree_reduce_backlog()\nAfter making all ->qlen_notify() callbacks idempotent, now it is safe to\nremove the check of qlen!=0 from both fq_codel_dequeue() and\ncodel_qdisc_dequeue()."], "name": "CVE-2025-37798", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Out of support scope", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-05-02T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2025-37798\nhttps://nvd.nist.gov/vuln/detail/CVE-2025-37798\nhttps://lore.kernel.org/linux-cve-announce/2025050212-CVE-2025-37798-1d06@gregkh/T"], "threat_severity": "Moderate"}

{"created": "2025-06-23T19:32:00.310704+00:00", "updated": "2025-06-23T19:32:00.310751+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}